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Derivative Instruments and Hedging Activities - Commodity Purchases (Details) - Not Designated As Hedging Instruments [Member] - USD ($) $ in Millions | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Commodity Purchases [Line Items] |  |
Liability value | $ 30 | $ 73
Asset value | 1 | 25
Current Assets [Member] |  |
Commodity Purchases [Line Items] |  |
Asset value | 1 | 20
Current Assets [Member] | Gas Contract |  |
Commodity Purchases [Line Items] |  |
Asset value | 1 | 20
Current Liabilities [Member] |  |
Commodity Purchases [Line Items] |  |
Liability value | 17 | 63
Current Liabilities [Member] | Gas Contract |  |
Commodity Purchases [Line Items] |  |
Liability value | 16 | 62
Noncurrent Assets [Member] |  |
Commodity Purchases [Line Items] |  |
Asset value | 0 | 5
Noncurrent Assets [Member] | Gas Contract |  |
Commodity Purchases [Line Items] |  |
Asset value | 0 | 5
Noncurrent Liabilities [Member] |  |
Commodity Purchases [Line Items] |  |
Liability value | 13 | 10
Noncurrent Liabilities [Member] | Gas Contract |  |
Commodity Purchases [Line Items] |  |
Liability value | $ 7 | $ 4

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